  * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Microsoft YaHei', sans-serif;
  }

  body {
      background: linear-gradient(135deg, #0c1445 0%, #1a237e 100%);
      color: #e0f7fa;
      line-height: 1.6;
      min-height: 100vh;
      overflow-x: hidden;
      position: relative;
  }

  /* 星空背景 */
  .stars-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: -1;
  }

  .star {
      position: absolute;
      background: #fff;
      border-radius: 50%;
      animation: twinkle var(--duration, 5s) infinite var(--delay, 0s);
  }

  @keyframes twinkle {

      0%,
      100% {
          opacity: 0.2;
      }

      50% {
          opacity: 1;
      }
  }

  /* 返回按钮 */
  .back-btn {
      position: fixed;
      top: 20px;
      left: 20px;
      z-index: 1000;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: rgba(33, 150, 243, 0.2);
      backdrop-filter: blur(5px);
      border: 1px solid rgba(79, 195, 247, 0.5);
      display: flex;
      justify-content: center;
      align-items: center;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 0 15px rgba(33, 150, 243, 0.3);
  }

  .back-btn:hover {
      background: rgba(33, 150, 243, 0.4);
      transform: translateX(-5px);
      box-shadow: 0 0 20px rgba(33, 150, 243, 0.5);
  }

  .back-btn i {
      font-size: 24px;
      color: #4fc3f7;
  }

  .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      position: relative;
      z-index: 1;
  }

  /* 头部区域 */
  header {
      text-align: center;
      padding: 100px 0 60px;
      position: relative;
  }

  .satellite-animation {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 300px;
      height: 300px;
  }

  .earth {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 120px;
      height: 120px;
      background: url('https://cdn.pixabay.com/photo/2016/07/30/20/52/earth-1557801_960_720.png') center/cover;
      border-radius: 50%;
      box-shadow: 0 0 30px rgba(79, 195, 247, 0.5);
  }

  .satellite {
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 30px;
      height: 30px;
      background: url('https://cdn-icons-png.flaticon.com/512/2043/2043923.png') center/cover;
      animation: orbit 12s linear infinite;
  }

  @keyframes orbit {
      0% {
          transform: translateX(-50%) rotate(0deg) translateX(150px) rotate(0deg);
      }

      100% {
          transform: translateX(-50%) rotate(360deg) translateX(150px) rotate(-360deg);
      }
  }

  h1 {
      font-size: 4rem;
      margin-bottom: 20px;
      text-shadow: 0 0 15px rgba(33, 150, 243, 0.7);
      letter-spacing: 3px;
      background: linear-gradient(to right, #4fc3f7, #29b6f6, #0288d1);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      animation: shine 3s infinite;
  }

  .subtitle {
      font-size: 1.8rem;
      margin-bottom: 30px;
      color: #bbdefb;
      max-width: 800px;
      margin: 0 auto 40px;
      line-height: 1.8;
      text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  }

  .china-flag {
      display: inline-block;
      width: 40px;
      height: 30px;
      background: linear-gradient(to right, #de2910 0%, #de2910 70%, #ffde00 70%, #ffde00 100%);
      border-radius: 4px;
      margin: 0 10px;
      vertical-align: middle;
      box-shadow: 0 0 10px rgba(222, 41, 16, 0.5);
  }

  @keyframes shine {
      0% {
          text-shadow: 0 0 10px rgba(33, 150, 243, 0.7);
      }

      50% {
          text-shadow: 0 0 20px rgba(33, 150, 243, 0.9), 0 0 30px rgba(33, 150, 243, 0.5);
      }

      100% {
          text-shadow: 0 0 10px rgba(33, 150, 243, 0.7);
      }
  }

  /* 内容区域 */
  .section {
      background: rgba(13, 19, 33, 0.8);
      border-radius: 15px;
      padding: 40px;
      margin: 50px 0;
      border: 1px solid rgba(33, 150, 243, 0.3);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
      backdrop-filter: blur(5px);
  }

  .section-title {
      font-size: 2.5rem;
      margin-bottom: 30px;
      color: #4fc3f7;
      border-bottom: 2px solid #0288d1;
      padding-bottom: 15px;
      display: flex;
      align-items: center;
  }

  .section-title i {
      margin-right: 15px;
  }

  /* 概述部分 */
  .intro-content {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      align-items: center;
      margin-top: 30px;
  }

  .intro-text {
      flex: 1;
      min-width: 300px;
      font-size: 1.2rem;
  }

  .intro-text p {
      margin-bottom: 25px;
      line-height: 1.8;
      text-align: justify;
  }

  .intro-image {
      flex: 1;
      min-width: 300px;
      border-radius: 15px;
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
      transition: transform 0.3s ease;
      border: 2px solid rgba(79, 195, 247, 0.3);
  }

  .intro-image:hover {
      transform: scale(1.03);
  }

  .intro-image img {
      width: 100%;
      height: auto;
      display: block;
  }

  /* 成就时间线 */
  .timeline {
      position: relative;
      max-width: 1000px;
      margin: 40px auto;
      padding-left: 30px;
  }

  .timeline::before {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 10px;
      width: 4px;
      background: linear-gradient(to bottom, #0288d1, #4fc3f7);
  }

  .timeline-item {
      position: relative;
      margin-bottom: 40px;
      padding-left: 30px;
  }

  .timeline-item::before {
      content: '';
      position: absolute;
      top: 10px;
      left: 0;
      width: 20px;
      height: 20px;
      background: #4fc3f7;
      border-radius: 50%;
      z-index: 1;
  }

  .timeline-year {
      font-size: 1.8rem;
      color: #4fc3f7;
      margin-bottom: 10px;
      font-weight: bold;
  }

  .timeline-content {
      background: rgba(2, 48, 89, 0.6);
      border-radius: 10px;
      padding: 20px;
      border: 1px solid rgba(33, 150, 243, 0.3);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  }

  .timeline-title {
      font-size: 1.5rem;
      margin-bottom: 10px;
      color: #bbdefb;
  }

  /* 卫星系统展示 */
  .satellite-systems {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 40px;
  }

  .system-card {
      background: rgba(13, 19, 33, 0.9);
      border-radius: 15px;
      padding: 30px;
      border: 1px solid rgba(33, 150, 243, 0.3);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
  }

  .system-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 5px;
      background: linear-gradient(to right, #de2910, #ffde00);
  }

  .system-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
  }

  .system-icon {
      font-size: 3.5rem;
      color: #ffde00;
      margin-bottom: 20px;
      text-align: center;
  }

  .system-title {
      font-size: 1.8rem;
      text-align: center;
      margin-bottom: 20px;
      color: #bbdefb;
  }

  .system-desc {
      font-size: 1.1rem;
      line-height: 1.7;
      margin-bottom: 20px;
  }

  .system-features {
      padding-left: 20px;
  }

  .system-features li {
      margin-bottom: 10px;
      display: flex;
      align-items: flex-start;
  }

  .system-features li i {
      color: #ffde00;
      margin-right: 10px;
      min-width: 20px;
      margin-top: 5px;
  }

  /* 应用领域 */
  .applications {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
      margin-top: 40px;
  }

  .app-card {
      background: rgba(13, 19, 33, 0.9);
      border-radius: 10px;
      padding: 30px 20px;
      text-align: center;
      border: 1px solid rgba(33, 150, 243, 0.3);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
  }

  .app-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 5px;
      background: linear-gradient(to right, #0288d1, #4fc3f7);
  }

  .app-card:hover {
      transform: translateY(-10px);
      background: rgba(2, 48, 89, 0.7);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  }

  .app-icon {
      font-size: 3rem;
      color: #4fc3f7;
      margin-bottom: 20px;
  }

  .app-title {
      font-size: 1.5rem;
      margin-bottom: 15px;
      color: #bbdefb;
  }

  .app-desc {
      font-size: 1rem;
      line-height: 1.6;
  }

  /* 未来展望 */
  .future-section {
      background: linear-gradient(to right, rgba(2, 48, 89, 0.7), rgba(13, 19, 33, 0.8));
      border-radius: 15px;
      padding: 50px;
      margin: 60px 0;
      border: 1px solid rgba(33, 150, 243, 0.3);
      position: relative;
      overflow: hidden;
  }

  .future-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('https://images.unsplash.com/photo-1462331940025-496dfbfc7564?q=80&w=1000') no-repeat center center;
      background-size: cover;
      opacity: 0.1;
      z-index: -1;
  }

  .future-title {
      font-size: 2.8rem;
      margin-bottom: 30px;
      color: #ffde00;
      text-align: center;
  }

  .future-content {
      max-width: 900px;
      margin: 0 auto;
      font-size: 1.2rem;
      line-height: 1.8;
  }

  .future-content p {
      margin-bottom: 25px;
      text-align: justify;
  }

  /* 页脚 */
  footer {
      text-align: center;
      padding: 50px 0 30px;
      color: #90a4ae;
      border-top: 1px solid rgba(33, 150, 243, 0.2);
      margin-top: 50px;
      font-size: 1.1rem;
  }

  .footer-logo {
      display: flex;
      justify-content: center;
      align-items: center;
      margin-bottom: 20px;
  }

  .footer-logo i {
      font-size: 2rem;
      color: #ffde00;
      margin: 0 15px;
  }

  .footer-text {
      margin-top: 20px;
      font-size: 1rem;
  }

  @media (max-width: 768px) {
      h1 {
          font-size: 2.8rem;
      }

      .subtitle {
          font-size: 1.4rem;
      }

      .section-title {
          font-size: 2rem;
      }

      .back-btn {
          width: 45px;
          height: 45px;
      }

      .back-btn i {
          font-size: 20px;
      }

      header {
          padding: 100px 0 40px;
      }

      .satellite-animation {
          width: 250px;
          height: 250px;
      }

      .section {
          padding: 30px 20px;
      }
  }